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a Template TODO: 'filename' in context
StaticContentHandlerTrait: static_content_name in comments

This stuff:  Still useless outside the walls of SparkFun.
Util\Text::clean_str() allows for extra substitutions
MongoFinder: isLike(), in(), reset()
various tweaks to Application & Environment behavior

- actions may now return Generators (useful for doing piece-at-a-time
  output in CLI applications)
- Environment now handles HTTP headers
- fixes a CLI routing bug with leading slashes
- Application&env() to return current Environment